Dear Michael,
First, thanks a lot for your suggestion. It seems to work very well.
However, trying to implement it into my code I realize the rest of my code
is simply running too slowly due to a lot of loops. The problem lies in the
step where I read in a text file showing the different communities. Having
read in the text file I have a file similar to temp and want to get
something like wanted, which shows me which cliques each node is a member
of.
*temp <- as.data.frame(rbind(c("0:",1,2,3,4,NA),c("1:",4,5,6,7,8)))*
*
*
*wanted <-
as.data.frame(cbind(c(1,2,3,4,5,6,7,8),c(1,1,1,1,2,2,2,2),c(0,0,0,2,0,0,0,0),c(0,0,0,0,0,0,0,0)))
*
*
*
So far I have transposed the temp matrix and made some loops over columns
(that's why clique "0:" is actually clique 1 in wanted etc.) but it is just
so very slow. Is there a fast way to see which cliques each node is part
of? I know they can maximally be part of, say 8 cliques in the large files.
I really appreciate your help.
Thanks,
Frederik
*
*
On Wed, Nov 16, 2011 at 6:39 PM, R. Michael Weylandt <
michael.weyla...@gmail.com> wrote:
> This is a little ugly, but I think it should work pretty robustly:
>
> T <- table(unlist(df[,-1])) # Take a close look at this to see how it
> works -- it's the key to the whole thing and basically creates
> something we will roughly use like a hash-table (if that term is
> familiar to you) (or more accurately, like a python dictionary)
>
> T[names(T) == "0"] <- 0 # Set zero back to zero if desired
>
> df[,-1] <- T[match(unlist(df[,-1]), names(T))]
>
> A heads up -- if your data are floating point numbers rather than
> integers, you might run into FAQ 7.31 trouble -- that's a much tougher
> question to work around, but hopefully still possible
>
> Michael
>
> On Wed, Nov 16, 2011 at 4:25 AM, Frederik Lyngsaa Lang
> <frederikl...@gmail.com> wrote:
> > Hi there,
> >
> > I am doing some network analysis working with k-cliques and over time I
> > want to see what nodes are members of what cliques and how big these
> > cliques are. I have managed to produce a matrix which shows which
> k-cliques
> > each node is part of over the 100 time periods (slow though) but I cannot
> > seem to calculate the size of each k-clique which is actually just a
> count.
> >
> > Basically I have a dataframe like this with V1 being the node ID's and
> > V2-V4 showing which k-cliques the nodes are part of :
> >
> >
> >
> >
> > df <-
> >
> as.data.frame(cbind(c(1,2,3,4,5,6,7,8),c(1,1,1,1,2,2,2,2),c(0,0,0,2,0,0,0,0),c(0,0,0,0,0,0,0,0)))
> >
> > # What I want is a dataframe like this where each k-clique value is
> > replaced by its size:
> >
> > wanted <-
> >
> as.data.frame(cbind(c(1,2,3,4,5,6,7,8),c(4,4,4,4,5,5,5,5),c(0,0,0,5,0,0,0,0),c(0,0,0,0,0,0,0,0)))
> >
> >
> >
> >
> > It seems simple but I cannot get it working since these dataframes grow
> for
> > each time period and the k-cliques change. I have tried using a loop that
> > references to a table of the values but it does not work. I am sure there
> > is an easy way, however.
> >
> >
> >
> > Hope to get some help,
> >
> >
> > Kind regards,
> >
> >
> > Frederik
> >
> > [[alternative HTML version deleted]]
> >
> > ______________________________________________
> > R-help@r-project.org mailing list
> > https://stat.ethz.ch/mailman/listinfo/r-help
> > PLEASE do read the posting guide
> http://www.R-project.org/posting-guide.html
> > and provide commented, minimal, self-contained, reproducible code.
> >
>
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